Removal and Installation

REMOVAL AND INSTALLATION









- MB991999: Valve Stem Seal Installer
- MD998051: Cylinder Head Bolt Wrench
- MD998735: Valve Spring Compressor
- MD998772: Valve Spring Compressor

REMOVAL SERVICE POINTS

[[A]]
CYLINDER HEAD BOLT REMOVAL





Use special tool MD998051 to loosen the cylinder head bolt.

[[B]]
RETAINER LOCK REMOVAL









1. Using special tool MD998735 or MD998772, compress the spring.
2. Remove the retainer locks.
NOTE:
Tag removed valves, springs and other components, noting their cylinder numbers and locations to facilitate reassembly. Store these components safely.

INSTALLATION SERVICE POINTS

]]A[[
VALVE STEM SEAL INSTALLATION





1. Install the valve spring seat.

CAUTION:

- Valve stem seals for intake valves and for exhaust valves are different. Be sure to install the correct ones.
- Valve stem seal identification color

Intake: GRAY

Exhaust: GRAY GREEN

CAUTION:
Always use the special tool to install the valve stem seal. Improperly installed valve stem seals may leak oil.





2. Using special tool MB991999, install a new stem seal to the valve guide.

]]B[[
VALVE SPRING INSTALLATION





Install the valve spring end with its identification color toward the spring retainer.

]]C[[
RETAINER LOCK INSTALLATION









Using special tool MD998735 or MD998772, compress the valve spring and insert the retainer lock into position.
NOTE:
The valve spring, if excessively compressed, causes the bottom end of retainer to damage the stem seal.

]]D[[
CYLINDER HEAD BOLT INSTALLATION

CAUTION:
Attach the head bolt washer in the direction shown in the figure.





1. Tighten the bolts in the illustrated sequence in two or three steps.
Tightening torque: 108± 5Nm (80± 4 ft-lb)
2. Back off the bolts once and tighten them again to the specified torque in step1.